package demo3;

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while(in.hasNextLine()) {
            String s = in.nextLine();
            boolean flag = false;//没有A
            boolean flag2 = true;
            boolean flag3 = true;//有c
            for (int i = 0; i < s.length(); i++) {
                if(s.charAt(i) == 'A') {
                    flag = true;
                }
                if(s.charAt(i) == 'C') {
                    flag3 = false;
                }
                if(s.charAt(i) == 'D') {
                    flag2 = false;
                    System.out.println("Never give up.");
                    break;
                }
            }
            if(flag2) {
                if(flag && flag3) {
                    System.out.println("I'm so happy.");
                } else {
                    System.out.println("This is ok.");
                }
            }
        }
    }
}
